JP2552132B2 - Discharge lamp ballast - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a discharge lamp ballast with a composite capacitor including a plurality of capacitor elements.

[Conventional technology]

In the rapid start type serial lighting discharge lamp ballast for 40W2 lamps having the circuit configuration illustrated in FIG. 4, a composite capacitor 7 including a plurality of capacitor elements C1 to C3 is attached. In FIG. 4, C1 is a starting auxiliary capacitor element, C2 is a phase advancing capacitor element, and C3 is a noise preventing capacitor element, and these are put together in one case to form a composite capacitor 7. The case of the composite capacitor 7 is often a metal container, which is fixed to the ballast body 1. This fixing is a metal-to-metal fixing and also serves as a ground connection to the metal container.

The means for fixing the composite capacitor 7 to the ballast body 1 is as shown in FIG. In FIG. 5 (a),
The mounting base 5 of the ballast body 1 is extended in one direction, and the composite capacitor 7 is placed and fixed thereon. The capacitor band 9 is used for this fixing. In FIG. 5B, the fixing claw 51 cut and raised from the mounting base 5 is bent to fix the capacitor mounting plate 6. The capacitor band 9 is used to connect the capacitor mounting plate 6 and the composite capacitor 7.
In FIG. 5 (C), the mounting base 5 and the capacitor mounting plate 6 are connected using screws 52.

[Problems to be solved by the invention]

The conventional structure shown in FIG. 5 does not take noise reduction into consideration. In the case of FIG. 5 (a), since the mounting base 5 extends, the electromagnetic vibration generated in the ballast body 1 is amplified. Fifth
In the cases of FIGS. (B) and (c), vibration isolation between the ballast body 1 and the capacitor mounting plate 6 is insufficient, and noise increases. Noise is reduced if a vibration-proof rubber seat is interposed in the fixing portion for vibration isolation, but the structure is complicated and assembly is troublesome.

An object of the present invention is to obtain a low noise type discharge lamp ballast that alleviates the above problems.

[Means for solving problems]

In the present invention, a composite capacitor including a non-metal case having an open end, a filler filled in the non-metal case, and a plurality of capacitor elements embedded in the filler is used. The composite capacitor is further embedded in the filling material,
An insulating terminal plate is provided for relay connection between the internal lead wire and the external lead wire from each capacitor element.

In the present invention, a part of the terminal plate is extended to the outside of the composite capacitor through the open hole of the non-metallic case, and this extended portion of the terminal plate is fixed to the mounting base of the ballast body.

[Action]

The connection between the ballast body and the composite capacitor is in the order of ballast body, mounting base, extension, terminal plate, filler, and non-metal case. Part of the electromagnetic vibration generated in the ballast body is transmitted to the non-metallic case, and an insulating terminal plate including an extending portion is interposed in the transmission path. Vibration transmission is mitigated at this extension.

The case of the composite capacitor is a non-metal case, so grounding is not necessary. Therefore, it is only necessary to fix the extending portion of the terminal plate to the ballast body.

〔Example〕

The embodiment of FIG. 1 according to the present invention will be described. First
The discharge lamp ballast shown includes a ballast body 1 and a composite capacitor 7. The composite capacitor 7 includes a non-metal case 72 whose one end is open, a filling material 74 filled in the non-metal case 72, and a filling material.
Includes multiple capacitor elements C1, C2, and C3 embedded in 74. Further, the composite capacitor 7 is embedded in the filling material 74 and includes an insulating terminal plate 71 for relay connection between the internal lead wire and the external lead wire from each of the capacitor elements C1, C2, and C3.
73 is the individual case of the capacitor elements C1, C2, C3.

A part of the terminal board 71 extends to the outside of the composite capacitor 7 through the open hole of the non-metallic case 72. The extending portion 75 of the terminal plate 71 is fixed to the mounting base 5 of the ballast main body 1.
This fixing is not a metal-to-metal fixing and has no meaning of electrical connection, but since the case 72 is made of a non-metallic material, the ground connection to it is not necessary.

It is not necessary to interpose something like a rubber seat for vibration damping between the mounting base 5 and the extension portion 75. This is because the extension portion 75 can be useful for vibration damping applications. It is conceivable to form an extended portion in a part of the non-metallic case 72 and use it as a vibration isolator, but this results in a restriction on the material or thickness of the entire case, which increases the cost. If the extension part is a separate and independent part, the above restriction is solved, but in this case, the number of parts increases and the cost increases.

In the ballast body 1 of FIG. 1, the coil 3 is attached to the iron core 2,
They are formed by fastening and fixing the cover 4 and the mounting base 5 from the upper and lower sides. The terminal plate 71 of the composite capacitor 7 is formed of, for example, polycarbonate having a strength capable of stably holding the entire composite capacitor 7. It is almost the same as the terminal plate 71 made of silicon rubber instead of polycarbonate. The terminal portion of the terminal plate 71 is inserted in the depth direction of the non-metallic case 72 and fixed by the filling material 74. The extending portion 75 at the other end of the terminal plate 71 is fixed to the mounting base 5 with screws 52.

Electromagnetic vibration of the ballast body 1 is transmitted to the composite capacitor 7 side via the mounting base 5 with almost no vibration damping.
However, the extension part 75 with large vibration damping after the mounting base 5
The terminal plate 71 including is interposed. Since the vibration is damped there, the vibration of the metal case 72 of the composite capacitor 7 becomes weak and the noise does not increase.

In another embodiment shown in FIG. 2, a non-metallic case
The terminal plate 71 is arranged in parallel with the open hole of 72. One end of the terminal plate 71 is bent at a right angle and extends outside the non-metallic case 72. The extending portion 75 is fixed to the mounting base 5. The degree of noise reduction by this is the same as that of FIG.

FIG. 3 is noise comparison data obtained by incorporating the discharge lamp ballasts of the above-described embodiment and the conventional example into a shaded fluorescent lamp fixture for 40 W2 lamps and comparing them from the viewpoint of fixture noise. The black dots in FIG. 3 represent the frequency, and the lateral chevron-shaped curve represents the frequency curve. For example, even in the embodiment of the present invention, instrument noise is 30
It seems that there was one case that slightly exceeded (dB). As is apparent from FIG. 3, according to the discharge lamp ballast of the present invention, the electromagnetic vibration of the ballast body 1 is greatly attenuated in the process of being transmitted to the composite capacitor 7, so that the increase in noise due to the composite capacitor 7 is reduced. To be done.

〔The invention's effect〕

As described above, according to the present invention, the case of the attached composite capacitor is a non-metal case, and a part of the terminal plate embedded in the filler in the metal case is extended to stabilize the extended portion. It is fixed to the mounting base of the main body. According to this, it can be used for the purpose of vibration damping by only partially changing the shape of the existing terminal board, and since the grounding work for the non-metallic case after fixing is not necessary, it is inexpensive. A discharge lamp ballast with less noise can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the discharge lamp ballast according to the present invention, FIG. 2 is a similar cross-sectional view showing another embodiment, and FIG. 3 compares the noises of the embodiment and the conventional example. A characteristic diagram, FIG. 4 is a circuit diagram of this type of discharge lamp ballast, (a), (b) of FIG.
(C) is a sectional view showing a conventional discharge lamp ballast. 1 ... Ballast body, 5 ... Mounting base, 7 ... Composite capacitor, 71 ... Terminal plate, 72 ... Non-metal case, 74 ... Filling material, 75 ... Extension part

Claims (1)

(57) [Claims] 1. A composite capacitor comprising a ballast body and a plurality of capacitor elements, wherein the composite capacitor has an open-ended non-metal case, a filler filled in the non-metal case, and a filler in the filler. A plurality of said capacitor elements embedded in, wherein said composite capacitor is embedded in said filling material,
An insulating terminal plate that relay-connects the internal lead wire and the external lead wire from each of the capacitor elements, and a part of the terminal plate is connected to the outside of the composite capacitor through an opening hole of the non-metallic case. The discharge lamp ballast, wherein the discharge lamp ballast is extended to the ballast, and the extending portion of the terminal plate is fixed to the mounting base of the ballast body.